Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability
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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability SWEDE Conference May 1, 2008 Van Nguyen [email protected] Pilot Program Review. Circuit History on Hockley (HK) -04 and -06 Circuit Demographics Reliability Performance

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Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability

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Pilot program on the application of electronic resettable sectionalizers to improve reliability

Pilot Program on the Application of Electronic Resettable Sectionalizers to Improve Reliability

SWEDE Conference

May 1, 2008

Van Nguyen

[email protected]


Pilot program review

Pilot Program Review

  • Circuit History on Hockley (HK) -04 and -06

    • Circuit Demographics

    • Reliability Performance

  • Root Cause Analysis on Circuit Operations and Fuse Outages

    • Review of Outage Data in Early 2005

    • Potential Solutions

  • Course of Action for Electronic Resettable Sectionalizers (ERS )

    • Functions

    • Advantages

    • Safety Concerns

    • Implemented by Early 2006

    • Education

  • Performance Results for 2006 and 2007


Circuit history

Circuit History

  • Circuit Demographics on HK-04 and HK-06

    • 12 kV circuits

    • Rural, agricultural areas

    • No static construction

    • Low customer count

      • HK-04 – 1,000 customers

      • HK-06 – 465 customers


Hk 04 lateral

HK-04 Lateral


Circuit history con t

Circuit History (con’t)

  • Reliability Performance on HK-04

    • 10% SAIDI circuit in 2003, 2004 and 2005

    • Excessive circuit operations in 2004

    • 9 specific fuses accounted for 60% of total circuit SAIDI minutes from potential temporary events (lightning, wind, wildlife, etc…) in 2004

    • Similar performance in 2003 and 2005


Circuit history con t1

Circuit History (con’t)

  • Reliability Performance on HK-06

    • 10% SAIDI circuit in 2004 and 2005

    • Excessive circuit operations in 2004

    • 5 specific fuses accounted for 58% of total circuit SAIDI minutes from potential temporary events in 2004


Root cause analysis

Root Cause Analysis

  • Review of Outage Data in Early 2005

    • 60% (HK-04) and 58% (HK-06) of total circuit SAIDI mins from potential temporary events in 2004

    • Excessive circuit operations in 2004

      • HK-04 – 27 operations

      • HK-06 – 36 operations

    • Source of excessive operations unknown

    • Fault current data ( < 1kA to > 4kA ) from relays indicated activities may be at multiple points


Root cause analysis con t

Root Cause Analysis (con’t)

  • Review of Outage Data in Early 2005

    • Lightning analysis investigation

      • No static construction

      • Flat, grasslands, agricultural areas

      • Temporary events such as lightning and wind

      • Erratic fault current values

      • Correlation between outages and lightning strikes


Mapping of hockley circuits

Mapping of Hockley Circuits


Lightning data plot for 2004

Lightning Data Plot for 2004


Root cause analysis con t1

Root Cause Analysis (con’t)

  • Investigation of Potential Solutions

    • Installation of lightning arresters

      • Effective but costly

    • Installation of static neutral

      • Effective but costly

    • Remote controlled equipment

      • Limited effectiveness

    • Electronic resettable sectionalizers (ERS)

      • Effective and economical


Course of action

Course of Action

  • Functions of ERS Devices

    • Works in conjunction with upstream reclosing protective device

    • Similar in operation as a typical sectionalizer

      • Registers current greater than its actuating level

      • Registers loss of voltage

      • Device opens on predetermined number of counts of fault current AND loss of voltage

    • 1, 2 and 3-count devices can be placed in series


Course of action con t

Course of Action (con’t)

  • Advantages of ERS Devices

    • Allow temporary faults to clear without experiencing a sustained interruption

    • Less expensive alternative to reclosers to isolate faulted (sustained) sections of conductor

    • Fits into standard fuse cutout body

    • Simple to install and implement

    • Ideal for replacing existing fuses


Course of action con t1

Course of Action (con’t)

  • Safety Concerns on ERS Devices

    • Must be used in conjunction with an upstream reclosing protective device

    • Cannot be blindly used to replace fuses

    • Detailed engineering analysis must be performed prior to implementing

    • Lack of familiarity by line crews on the operation of ERS devices


Course of action con t2

Course of Action (con’t)

  • Implemented by Early 2006

    • Protection analysis conducted by engineering

    • Breaker coordination with hydraulic reclosers

    • HK-04

      • 3 hydraulic reclosers installed

      • 9 fuses replaced with ERS devices

    • HK-06

      • 1 hydraulic recloser installed

      • 5 fuses replaced with ERS devices


Hockley 04 oneline

Hockley-04 Oneline


Recloser 127z

Recloser 127Z


Sectionalizer 112n

Sectionalizer 112N


Hockley 06 oneline

Hockley-06 Oneline


Course of action con t3

Course of Action (con’t)

  • Education

    • Line crews trained on application

    • Article published in company-wide newsletter

    • Stenciling nomenclature (###N or N###)


Stenciling nomenclature

Stenciling Nomenclature


Performance results for 2006

Performance Results for 2006

  • HK-04 and HK-06

    • 47% combined decrease in SAIDI values

    • Neither repeated as 10% SAIDI circuits

  • Pilot program deemed successful

  • CPE approved the deployment of ERS devices on other circuits


Performance results for 2007

Performance Results for 2007

  • HK-06 was not a 2007 10% SAIDI circuit

  • HK-04 was a 2007 10% SAIDI circuit

    • 16% of total circuit SAIDI mins from potential temporary events behind line fuses

    • Trees, collisions, material failures and unknown causes also contributed to SAIDI mins


Questions

Questions?


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